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Chicane simulation update

Chicane simulation update. Pavel Snopok Front end phone meeting January 14, 2014. Last time: ICOOL vs G4beamline. Number of muons. Number of useful muons within canonical cuts. Relatively large statistics: 300k incident particles, correct distribution

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Chicane simulation update

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  1. Chicane simulation update Pavel Snopok Front end phone meeting January 14, 2014

  2. Last time: ICOOL vs G4beamline Number of muons Number of useful muons within canonical cuts Relatively large statistics: 300k incident particles, correct distribution (wrong distribution sent earlier by email, no 2 ns correction to time)

  3. Source of discrepancy, mitigation • Be proton absorber is causing a difference in transmission. • ICOOL does not simulate pion propagation through material properly. • Use G4beamline for the part of the channel where pions are of concern (capture + drift). • Move the proton absorber downstream (following Dave’s ICOOL decks). • There is no G4beamline deck for the 325 MHz, 2 T frontend => working on it right now.

  4. Pions through absorber:ICOOL vs G4beamline G4beamline ICOOL

  5. Pions: effect of moving the absorber

  6. New chicane: 2 T

  7. New Front End in G4beamline • You won’t see it in the picture, but the arc length of each cell in the chicane is slightly different from that in the drift part. • The reason is the BSOL approach: I take the SREGION length + curvature to define the chicane angle => chicane arc length • …while Chris was using a predefined number of cells of a certain arc length (250 mm) + angle per cell, and the Z length was derived from those. • What I do is choose the cell length as close to 250 mm as possible based on the chicane arc length derived from BSOL parameters. • This way the chicane length is the same in ICOOL and G4bl.

  8. Current status I have: • the short taper (14.75 m), • some initial drift (6 m), • chicane at 2 T (12 m), • second part of the drift (43 m). I don’t have: • Buncher/phase rotator/matcher/cooler, but presumably those could be simulated in ICOOL, since pions are not an issue anymore.

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